參數(shù)資料
型號: INA121PA
元件分類: 運算放大器
英文描述: CAP, 220UF @ 50V
中文描述: FET輸入,低功耗儀表放大器
文件頁數(shù): 12/12頁
文件大?。?/td> 220K
代理商: INA121PA
12
INA121
INA121
R
G
/2
R
G
= 5.6k
V
O
LA
RL
RA
10k
Ref
NOTE: Due to the INA121’s current-feedback
topology, V
is approximately 0.7V less than
the common-mode input voltage. This DC offset
in this guard potential is satisfactory for many
guarding applications.
Low bias current
allows use with high
electrode impedances.
G = 10
2.8k
V
G
V
G
2.8k
1/2
OPA2131
390k
390k
1/2
OPA2131
FIGURE 12. Multiplexed-Input Data Acquisition System.
FIGURE 13. Shield Driver Circuit.
INA121
V
IN
V
IN
+
OPA130
511
22.1k
22.1k
Ref
V
O
For G = 100
R
= 511
// 2(22.1k
)
effective R
G
= 505
100
NOTE: Driving the shield minimizes CMR degradation
due to unequally distributed capacitance on the input
line. The shield is driven at approximately 1V below
the common-mode input voltage.
FIGURE 14. ECG Amplifier With Right-Leg Drive.
INA121
V
IN
+
V
IN
+
Channel 8
Channel 1
MPC800
MUX
ADS7816
+5V
V
REF
+In
–In
12 Bits Out
Serial
R
G
Ref
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